djs, I get my AM 500 from Shelby Fish Farm in Anna Ohio that you mentioned.Smaller amounts are pricey per lb but find very few places will sell less than 50 lb. Shipping eats a lot of that cost. Steve Heitman is great to do business with.I ordered 2 more bags to finish up just last night. Water temp 64 in the top 2 ft with about 12 ppm DO so fish very happy and feeding well twice per day. One item I found interesting with AM Grower is that it only has 1.15 actual P and the pellets that end up in the rock apron on windy days do not seem to set any algae growth off like I have had happen with other feeds. This is only my second year with AM but I wont use anything else.